Method for obtaining three-dimensional information by using field depth of planar picture and application of method

A technology of three-dimensional information and photos, applied in the field of scientific applications, can solve problems such as cumbersome calculations and inaccurate data

Inactive Publication Date: 2012-12-05
EAST CHINA NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods need to measure a large amount of data and perform tedious calculations to obtain the data, but the obtained data are not accurate

Method used

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  • Method for obtaining three-dimensional information by using field depth of planar picture and application of method

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Embodiment Construction

[0017] The technical characteristics of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0018] Establish a standard scale on a 50m runway, use the 18mm wide-angle end of the Nikon D60+Nikkor18-55 digital camera, install a level on the camera, and use a tripod to shoot (fixed height 1.2m). Use a tape measure on the ground to calculate the distance, take a photo of the 1m high pole at 3m intervals, and combine the photos to obtain a depth of field unit within 0-50m.

[0019] The obtained data is fit through exponential regression to obtain the depth of field equation of the camera:

[0020] Y=309.9x -2.33

[0021] R 2 =0.992

[0022] Y=24.16x -0.97

[0023] R 2 =0.998

[0024] Y=23.65x -0.96

[0025] R2 = 0.998

[0026] Such as figure 1 As shown, after the photos are obtained on the spot, the number of pixels occupied by the tree in the picture is calculated by Photoshop software, so as t...

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Abstract

The invention relates to a method for obtaining three-dimensional information by using the field depth of a planar picture. The method comprises the following steps: 1) firstly establishing a standard coordinate, adopting an established camera and a lens, additionally arranging a level gauge on the camera, shooting by adopting a triangular support, calculating the distance by using a tape measure on the ground, taking one picture for a range pole of a certain height at every same interval, and synthesizing the taken pictures so as to obtain a field depth unit within 0-50m; 2) carrying out the exponential regression fitting degree on the obtained data so as to obtain a field depth equation of the camera; and after obtaining the picture on the spot, calculating the number of pixel points of a tree in the picture by using the Photoshop software so as to obtain data on the height of the tree, the height of the crown, the diameter of the crown and the diameter at breast height. The invention innovatively provides a field depth method, the dimension of field depth is added into a two-dimensional picture, and three-dimensional information is read from an original planar picture; and the defects that the calculation is complex and the measurement is inaccurate due to the fact that a surveyor's rod or an ocular estimate method is used in existing ecology research are prevented.

Description

technical field [0001] The invention relates to a method for obtaining stereoscopic information by utilizing the depth of field of a planar photo, and the scientific application of the method. Background technique [0002] Depth of field refers to the object distance range measured along the axis of the imaging depth of field camera that can obtain clear images in front of the camera lens or other imagers. After the focus is completed, a clear image can be formed in the range before and after the focus. This distance range before and after is called the depth of field. There is a certain length of space in front of the lens (before and after the focusing point). When the subject is located in this space, its image on the film is just between the two circles of confusion before and after the focus. The length of the space where the subject is located is called the depth of field. In other words, for the subjects in this space, the blurring degree of the image presented on t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C11/08
Inventor 郭海骏费希旸
Owner EAST CHINA NORMAL UNIV
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